| Regimental number | 52841 |
| Date of birth | |
| Place of birth | Ballarat, Victoria |
| Religion | Roman Catholic |
| Occupation | Moulder |
| Address | 1011 South Street, Ballarat, Victoria |
| Marital status | Single |
| Age at embarkation | 18 |
| Height | 5' 8" |
| Weight | 139 lbs |
| Next of kin | Father, Mr Edward Thomas O'Neill, 1011 South Street, Ballarat, Victoria |
| Previous military service | Served for 4 years in Senior Cadets, Citizen Forces |
| Enlistment date | |
| Place of enlistment | Ballarat, Victoria |
| Unit name | 2nd General Service Reinforcements (Egypt) (Victoria) |
| Embarkation details | Unit embarked from Sydney, New South Wales, on board HMAT A18 Wiltshire on |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 15th Light Horse Regiment |
| Fate | Returned to Australia |
| Discharge date | |
| Other details |
War service: Egypt Commenced return to Australia on board HT 'Dongola', 24 July 1919; disembarked Melbourne, 28 August 1919; discharged (termination of period of enlistment), Melbourne, 9 September 1919. Medal: British War Medal |
| Sources | NAA: B2455, O'NEILL Arnold Charles |